Return to bus.h CVS log

Up to [local] / prex-old / dev / include

Port OpenBSD bus_space(9), a machine independent bus abstraction layer.
Only little subset of operations are planned for implementation now:
bus_space_{map,unmap}();
bus_space_subregion();
bus_space_barrier();
bus_space_read_{1,2,4}();
bus_space_write_{1,2,4}();

/*
 * $Id: bus.h,v 1.1 2008/08/08 12:56:41 nbrk Exp $
 */
/*	$OpenBSD: bus.h,v 1.8 2007/04/10 18:22:08 miod Exp $	*/
/*	$NetBSD: bus.h,v 1.12 2003/10/23 15:03:24 scw Exp $	*/

/*-
 * Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *	for the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _INCLUDE_BUS_H_
#define _INCLUDE_BUS_H_

#include <driver.h>

/*
 * Addresses (in bus space).
 */
typedef u_long bus_addr_t;
typedef u_long bus_size_t;

/*
 * Access methods for bus space.
 */
typedef struct bus_space *bus_space_tag_t;
typedef u_long bus_space_handle_t;

/*
 *	int bus_space_map  (bus_space_tag_t t, bus_addr_t addr,
 *	    bus_size_t size, int flags, bus_space_handle_t *bshp);
 *
 * Map a region of bus space.
 */

#define	BUS_SPACE_MAP_CACHEABLE		0x01
#define	BUS_SPACE_MAP_LINEAR		0x02
#define	BUS_SPACE_MAP_PREFETCHABLE     	0x04

struct bus_space {
	/* cookie */
	void		*bs_cookie;

	/* mapping/unmapping */
	int		(*bs_map) (void *, bus_addr_t, bus_size_t,
			    int, bus_space_handle_t *);
	void	(*bs_unmap) (void *, bus_space_handle_t,
			    bus_size_t);
    int     (*bs_subregion) (void *, bus_space_handle_t,
                bus_size_t, bus_size_t, bus_space_handle_t *);

	/* barrier */
	void		(*bs_barrier) (void *, bus_space_handle_t,
			    bus_size_t, bus_size_t, int);

	/* read (single) */
	uint8_t	(*bs_r_1) (void *, bus_space_handle_t,
			    bus_size_t);
	uint16_t	(*bs_r_2) (void *, bus_space_handle_t,
			    bus_size_t);
	uint32_t	(*bs_r_4) (void *, bus_space_handle_t,
			    bus_size_t);

	/* write (single) */
	void		(*bs_w_1) (void *, bus_space_handle_t,
			    bus_size_t, uint8_t);
	void		(*bs_w_2) (void *, bus_space_handle_t,
			    bus_size_t, uint16_t);
	void		(*bs_w_4) (void *, bus_space_handle_t,
			    bus_size_t, uint32_t);
};


/*
 * Utility macros; INTERNAL USE ONLY.
 */
#define	__bs_c(a,b)		__CONCAT(a,b)
#define	__bs_opname(op,size)	__bs_c(__bs_c(__bs_c(bs_,op),_),size)

#define	__bs_rs(sz, t, h, o)						\
	(*(t)->__bs_opname(r,sz))((t)->bs_cookie, h, o)
#define	__bs_ws(sz, t, h, o, v)						\
	(*(t)->__bs_opname(w,sz))((t)->bs_cookie, h, o, v)
#define	__bs_nonsingle(type, sz, t, h, o, a, c)				\
	(*(t)->__bs_opname(type,sz))((t)->bs_cookie, h, o, a, c)

/*
 * Mapping and unmapping operations.
 */
#define	bus_space_map(t, a, s, c, hp)					\
	(*(t)->bs_map)((t)->bs_cookie, (a), (s), (c), (hp))
#define	bus_space_unmap(t, h, s)					\
	(*(t)->bs_unmap)((t)->bs_cookie, (h), (s))
#define	bus_space_subregion(t, h, o, s, hp)				\
	(*(t)->bs_subregion)((t)->bs_cookie, (h), (o), (s), (hp))

/*
 * Bus barrier operations.
 */
#define	bus_space_barrier(t, h, o, l, f)				\
	(*(t)->bs_barrier)((t)->bs_cookie, (h), (o), (l), (f))

#define	BUS_SPACE_BARRIER_READ	0x01
#define	BUS_SPACE_BARRIER_WRITE	0x02

/*
 * Bus read (single) operations.
 */
#define	bus_space_read_1(t, h, o)	__bs_rs(1,(t),(h),(o))
#define	bus_space_read_2(t, h, o)	__bs_rs(2,(t),(h),(o))
#define	bus_space_read_4(t, h, o)	__bs_rs(4,(t),(h),(o))

/*
 * Bus write (single) operations.
 */
#define	bus_space_write_1(t, h, o, v)	__bs_ws(1,(t),(h),(o),(v))
#define	bus_space_write_2(t, h, o, v)	__bs_ws(2,(t),(h),(o),(v))
#define	bus_space_write_4(t, h, o, v)	__bs_ws(4,(t),(h),(o),(v))


/*
 * Macros to provide prototypes for all the functions used in the
 * bus_space structure
 */

#define bs_map_proto(f)							\
int	__bs_c(f,_bs_map) (void *t, bus_addr_t addr,		\
	    bus_size_t size, int cacheable, bus_space_handle_t *bshp);

#define bs_unmap_proto(f)						\
void	__bs_c(f,_bs_unmap) (void *t, bus_space_handle_t bsh,	\
	    bus_size_t size);

#define bs_subregion_proto(f)						\
int	__bs_c(f,_bs_subregion) (void *t, bus_space_handle_t bsh,	\
	    bus_size_t offset, bus_size_t size, 			\
	    bus_space_handle_t *nbshp);

#define bs_barrier_proto(f)						\
void	__bs_c(f,_bs_barrier) (void *t, bus_space_handle_t bsh,	\
	    bus_size_t offset, bus_size_t len, int flags);

#define	bs_r_1_proto(f)							\
uint8_t	__bs_c(f,_bs_r_1) (void *t, bus_space_handle_t bsh,	\
		    bus_size_t offset);

#define	bs_r_2_proto(f)							\
uint16_t	__bs_c(f,_bs_r_2) (void *t, bus_space_handle_t bsh,	\
		    bus_size_t offset);

#define	bs_r_4_proto(f)							\
uint32_t	__bs_c(f,_bs_r_4) (void *t, bus_space_handle_t bsh,	\
		    bus_size_t offset);

#define	bs_w_1_proto(f)							\
void	__bs_c(f,_bs_w_1) (void *t, bus_space_handle_t bsh,		\
	    bus_size_t offset, uint8_t value);

#define	bs_w_2_proto(f)							\
void	__bs_c(f,_bs_w_2) (void *t, bus_space_handle_t bsh,		\
	    bus_size_t offset, uint16_t value);

#define	bs_w_4_proto(f)							\
void	__bs_c(f,_bs_w_4) (void *t, bus_space_handle_t bsh,		\
	    bus_size_t offset, uint32_t value);

#define bs_protos(f)		\
bs_map_proto(f);		\
bs_unmap_proto(f);		\
bs_subregion_proto(f);		\
bs_barrier_proto(f);		\
bs_r_1_proto(f);		\
bs_r_2_proto(f);		\
bs_r_4_proto(f);		\
bs_r_8_proto(f);		\
bs_w_1_proto(f);		\
bs_w_2_proto(f);		\
bs_w_4_proto(f);		\
bs_w_8_proto(f);

#endif /* _INCLUDE_BUS_H_ */